Change color of text - CSS

On my Wordpress page the side menu has a list of pages. The current page link displays as white, instead of the regular color. I want the current page link to appear as black instead, but am having trouble finding which CSS rule is making this text white. Can someone take a look and see if they can find which CSS rule is making the current page link white? The page is here:

Featured Post

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

The purpose of this video is to demonstrate how to reset a WordPress password if you are locked
out and cannot reset the password. A typical use would be if you cannot access the email to which
WordPress would send the password recovery email to…

The purpose of this video is to demonstrate how to add AdSense Ads to a WordPress Website, and
how to set up WordPress to automatically place Ads in Sidebars.
This will be demonstrated using a Windows 8 PC.
Log into your AdSense account. : Cli…